/Engine/Plugins/Online/OnlineServices/Source/OnlineServicesInterface/Public/Online/Sessions.h
Parameters for the AddSessionMember call
[TOnlineAsyncOpHandle](API\Plugins\OnlineServicesInterface\Online\TOnlineAsyncOpHandle)< [FAddSessionMember](API\Plugins\OnlineServicesInterface\Online\FAddSessionMember) > AddSessionMember ( [FAddSessionMember::Params](API\Plugins\OnlineServicesInterface\Online\FAddSessionMember\Params) && Params )